Python – Assign Alphabet to each element

Given a list of elements, assign similar alphabet to same element.

Input : test_list = [4, 5, 2, 4, 2, 6]
Output : [‘a’, ‘b’, ‘c’, ‘a’, ‘c’, ‘d’]
Explanation : Alphabets assigned to elements as occurring.

Input : test_list = [4, 5, 2, 4, 2, 6]
Output : [‘a’, ‘b’, ‘c’, ‘a’, ‘c’]
Explanation : Alphabets assigned to elements as occurring.

Method #1 : Using ascii_lowecase() + loop + list comprehension

In this, we extract all lowercase alphabets using lowercase(), and create dictionary mapping same element to similar character, post that we flatten that to appropriate index using list comprehension.

Python3

 `# Python3 code to demonstrate working of  ` `# Assign Alphabet to each element ` `# Using ascii_lowecase() + loop + list comprehension ` `import` `string ` ` `  `# initializing list ` `test_list ``=` `[``4``, ``5``, ``2``, ``4``, ``2``, ``6``, ``5``, ``2``, ``5``] ` ` `  `# printing list ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `temp ``=` `{} ` `cntr ``=` `0` `for` `ele ``in` `test_list: ` `    ``if` `ele ``in` `temp: ` `        ``continue` `     `  `    ``# assiging same Alphabet to same element ` `    ``temp[ele] ``=` `string.ascii_lowercase[cntr] ` `    ``cntr ``+``=` `1` `     `  `# flattening  ` `res ``=` `[temp.get(ele) ``for` `ele ``in` `test_list] ` ` `  `# printing results  ` `print``(``"The mapped List : "` `+` `str``(res)) `

Output

```The original list : [4, 5, 2, 4, 2, 6, 5, 2, 5]
The mapped List : ['a', 'b', 'c', 'a', 'c', 'd', 'b', 'c', 'b']
```

Method #2 : Using defaultdict() + ascii_lowercase() + iter()

In this we use defaultdict() to assign values to similar elements, ascii_lowercase() is used to get all lowercase all lowercased alphabets.

Python3

 `# Python3 code to demonstrate working of  ` `# Assign Alphabet to each element ` `# Using defaultdict() + ascii_lowercase() + iter() ` `from` `collections ``import` `defaultdict ` `import` `string  ` ` `  `# initializing list ` `test_list ``=` `[``4``, ``5``, ``2``, ``4``, ``2``, ``6``, ``5``, ``2``, ``5``] ` ` `  `# printing list ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# assigning lowecases as iterator ` `temp ``=` `iter``(string.ascii_lowercase) ` ` `  `# lambda functions fits to similar elements  ` `res ``=` `defaultdict(``lambda``: ``next``(temp)) ` ` `  `# flatten in list  ` `res ``=` `[res[key] ``for` `key ``in` `test_list] ` ` `  `# printing results  ` `print``(``"The mapped List : "` `+` `str``(``list``(res))) `

Output

```The original list : [4, 5, 2, 4, 2, 6, 5, 2, 5]
The mapped List : ['a', 'b', 'c', 'a', 'c', 'd', 'b', 'c', 'b']
```

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